/Engine/Source/Editor/KismetCompiler/Public/EdGraphCompilerUtilities.h
Scans a graph for a node of the specified class. Can optionally continue scanning and print errors if additional nodes of the same category are found.
[UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) * FindNodeByClass ( const [UEdGraph](API\Runtime\Engine\EdGraph\UEdGraph) * Graph, [TSubclassOf](API\Runtime\CoreUObject\Templates\TSubclassOf)< [UEdGraphNode](API\Runtime\Engine\EdGraph\UEdGraphNode) > NodeClass, bool bExpectedUnique ) const